CHAPTER 79
ZINC AND ARTICLES THEREOF
XV
79-1
Subheading Note
1. In this chapter the following expressions have the meanings hereby assigned to them:
(a)  Zinc, not alloyed
Metal containing by weight at least 97.5 percent of zinc.
(b)  Zinc alloys
Metallic substances in which zinc predominates by weight over each of the other elements, provided that the total content by weight of such other elements exceeds 2.5 percent.
(c)  Zinc dust
Dust obtained by condensation of zinc vapor, consisting of spherical particles which are finer than zinc powders. At least 80 percent by weight of the particles pass through a sieve with 63 micrometers (microns) mesh. It must contain at least 85 percent by weight of metallic zinc.
Additional U.S. Note
1.  For the purposes of heading 7901, "casting-grade zinc" contains by weight at least 97.5 percent of zinc and contains by weight one or more of the following elements in the quantity indicated:
(a) more than 1.8 percent of lead,
(b) more than 1.8 percent of cadmium,
(c) more than 1.8 percent of iron,
(d) more than 0.5 percent of aluminum,
(e) more than 1 percent of copper,
(f) more than 0.08 percent of titanium,
(g) more than 0.1 percent of any other base metal, taken separately.

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